[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.214487] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.351420] random: sshd: uninitialized urandom read (32 bytes read) [ 21.674556] random: sshd: uninitialized urandom read (32 bytes read) [ 22.368315] random: sshd: uninitialized urandom read (32 bytes read) [ 22.526814] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.41' (ECDSA) to the list of known hosts. [ 28.124189] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.216673] WARNING: CPU: 0 PID: 4490 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 28.225059] Kernel panic - not syncing: panic_on_warn set ... [ 28.225059] [ 28.232410] CPU: 0 PID: 4490 Comm: syz-executor545 Not tainted 4.17.0-rc3+ #34 [ 28.239750] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.249085] Call Trace: [ 28.251667] dump_stack+0x1b9/0x294 [ 28.255277] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.260449] ? smc_unhash_sk+0x310/0x4a0 [ 28.264492] panic+0x22f/0x4de [ 28.267662] ? add_taint.cold.5+0x16/0x16 [ 28.271800] ? __warn.cold.8+0x148/0x1b3 [ 28.275848] ? __warn.cold.8+0x117/0x1b3 [ 28.279889] ? smc_unhash_sk+0x345/0x4a0 [ 28.283932] __warn.cold.8+0x163/0x1b3 [ 28.287800] ? smc_unhash_sk+0x345/0x4a0 [ 28.291841] report_bug+0x252/0x2d0 [ 28.295455] do_error_trap+0x1de/0x490 [ 28.299327] ? graph_lock+0x170/0x170 [ 28.303110] ? math_error+0x420/0x420 [ 28.306898] ? lock_acquire+0x1dc/0x520 [ 28.310862] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.315690] do_invalid_op+0x1b/0x20 [ 28.319397] invalid_op+0x14/0x20 [ 28.322835] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 28.327479] RSP: 0018:ffff8801d96f7488 EFLAGS: 00010293 [ 28.332933] RAX: ffff8801d97fa680 RBX: ffff8801d97507c0 RCX: ffffffff87402b7e [ 28.340194] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 28.347449] RBP: ffff8801d96f7570 R08: ffff8801d97fa680 R09: ffffed003b2ea108 [ 28.354786] R10: ffffed003b2ea108 R11: ffff8801d9750843 R12: 1ffff1003b2dee95 [ 28.362040] R13: ffff8801d96f7548 R14: ffffffff8970e8a0 R15: ffff8801d9750840 [ 28.369303] ? smc_unhash_sk+0x28e/0x4a0 [ 28.373363] ? smc_unhash_sk+0x345/0x4a0 [ 28.377406] ? smc_unhash_sk+0x345/0x4a0 [ 28.381451] ? smc_rx_data_available+0x100/0x100 [ 28.386188] ? release_sock+0x1e2/0x2b0 [ 28.390147] ? __local_bh_enable_ip+0x161/0x230 [ 28.394809] ? __release_sock+0x3a0/0x3a0 [ 28.398939] ? smc_release+0x269/0x610 [ 28.402809] ? trace_hardirqs_on+0xd/0x10 [ 28.406940] ? __local_bh_enable_ip+0x161/0x230 [ 28.411595] smc_release+0x36e/0x610 [ 28.415297] sock_release+0x96/0x1b0 [ 28.419005] ? sock_alloc_file+0x4e0/0x4e0 [ 28.423232] sock_close+0x16/0x20 [ 28.426669] __fput+0x34d/0x890 [ 28.429931] ? fput+0x1a0/0x1a0 [ 28.433196] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.437676] ____fput+0x15/0x20 [ 28.440945] task_work_run+0x1e4/0x290 [ 28.444813] ? task_work_cancel+0x240/0x240 [ 28.449127] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 28.454650] ? switch_task_namespaces+0xa2/0xd0 [ 28.459302] do_exit+0x1aee/0x2730 [ 28.462827] ? mm_update_next_owner+0x980/0x980 [ 28.467476] ? kasan_check_read+0x11/0x20 [ 28.471607] ? do_raw_spin_unlock+0x9e/0x2e0 [ 28.475998] ? __local_bh_enable_ip+0x161/0x230 [ 28.480658] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.485656] ? release_sock+0x1e2/0x2b0 [ 28.489612] ? trace_hardirqs_on+0xd/0x10 [ 28.493743] ? __local_bh_enable_ip+0x161/0x230 [ 28.498395] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.502792] ? kasan_check_read+0x11/0x20 [ 28.506922] ? rcu_is_watching+0x85/0x140 [ 28.511067] ? rcu_pm_notify+0xc0/0xc0 [ 28.514940] ? ___sys_sendmsg+0x31a/0x940 [ 28.519071] ? kfree+0x1e9/0x260 [ 28.522419] ? ___sys_sendmsg+0x31f/0x940 [ 28.526548] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.532068] ? __handle_mm_fault+0x93a/0x4310 [ 28.536550] ? copy_msghdr_from_user+0x560/0x560 [ 28.541291] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 28.546040] ? graph_lock+0x170/0x170 [ 28.549832] ? find_held_lock+0x36/0x1c0 [ 28.553881] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.559399] ? __fget_light+0x2ef/0x430 [ 28.563356] ? fget_raw+0x20/0x20 [ 28.566790] ? find_held_lock+0x36/0x1c0 [ 28.570838] ? lock_downgrade+0x8e0/0x8e0 [ 28.574969] ? handle_mm_fault+0x8c0/0xc70 [ 28.579192] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.584718] ? sockfd_lookup_light+0xc5/0x160 [ 28.589206] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.594734] ? __sys_sendmsg+0x1aa/0x270 [ 28.598784] ? __ia32_sys_shutdown+0x80/0x80 [ 28.603180] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.608707] ? __do_page_fault+0x441/0xe40 [ 28.612956] do_group_exit+0x16f/0x430 [ 28.616837] ? __ia32_sys_exit+0x50/0x50 [ 28.620892] ? do_syscall_64+0x92/0x800 [ 28.624869] __x64_sys_exit_group+0x3e/0x50 [ 28.629181] do_syscall_64+0x1b1/0x800 [ 28.633055] ? syscall_return_slowpath+0x5c0/0x5c0 [ 28.637965] ? syscall_return_slowpath+0x30f/0x5c0 [ 28.642880] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 28.648229] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.653065] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.658245] RIP: 0033:0x43e9d8 [ 28.661414] RSP: 002b:00007ffdb3b75de8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.669104] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9d8 [ 28.676356] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 28.683619] RBP: 00000000004be380 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 28.690880] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 28.698130] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 28.706007] Dumping ftrace buffer: [ 28.709634] (ftrace buffer empty) [ 28.713324] Kernel Offset: disabled [ 28.716937] Rebooting in 86400 seconds..